Description
A delay or blockage of electrical signals to the left side of the heart.
Overview
Left bundle branch block sometimes makes it harder for the heart to pump blood to the rest of the body. High blood pressure, a heart attack, and thickening, stiffness or irritation of the heart muscle can cause it.
Symptoms
Most people don't have symptoms. If they occur, they include fainting or a slow heart rate.
Treatments
Treatment depends on the cause. Any underlying condition, such as heart disease, should be treated. Some people need a device called a pacemaker to help the heart beat.
Last Updated: May 12th, 2026
Talk to a Beacon Provider about Primary Care